I suggest you to put many other options because there are few and if by chance I want to make a report of teaming/ crossteaming instead that make the video and report in the forum would be more convenient (in case there are online mods in the game) report directly in the game.
But not only that. There are also other types of hacks that are not written between hacks to report in game (example: reach)
When you report on Bedrock a certain number of people must report for it to be forwarded to staff. When it comes to teaming it's unlikely this quota will be reached in 1 game I think. And if it was, there's no guarentee there will be evidence of teaming when the moderator spectates them. Often one dies, and usually, teaming doesn't go on for more than one game as far as I can see.
As for reach: this is intentional, as staff have said multiple times before; lots of players mistake combos/lag for reach, which would mean a lot of people would be reported for reach that weren't actually using disallowed mods. If someone really is reaching it's best to just take a video and report them on the forums